Trammel-point



(No'ModeL) v D. BRUNO.

TRAMMELPOINT. No. 493,062. Pate nted'Mar; 7, 1893.

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UNITED STATES PATENT OFFICE.

DES IRE BRUNO, OF AVONDALE, I LLINO IS.

TRAMMEL-POINT.

SPECIFICATION forming part of Letters Patent No. 493,062, dated March 7, 1893.

Application filed August 23,1892- $erial No. 443,913. (No model.)

To aZZ'w/wm, zit-may concern Be it known that I, DESIRE BRUNO,a citizen of the United States, residing at Avondale, in the county of Cook and State of Illinois, have invented certain new and useful Improvementsin Trammel-Points; and I do hereby declare the following to be a full,'clear, and exact description ofthe invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a novel construction in a trammel-point, and consists in the features of construction and combinations of parts hereinafter fully described and specifically claimed.

In the accompanyingdrawings illustrating myinvention,-Figure l is a perspective view of the same attached to a ruler. Fig. 2 is a front elevation. Figs. 3, 4 and 5 are sectional views taken respectively on the lines 3+3,

- 44 and 55 of Fig. 2. I

Referring now to said drawings, A indicatesas a whole my improved trammel-point which consists of a frame or body piece 1 having a notch or open slot in its front face, as indicated by 2. Said notch or open slot is parallel with the top and bottom sides of the body piece 1, .while the rear wall 3 of said notch or open slot 2 is straight, so that when the trammel-point is applied to a ruler or other straight edge it will fit nicely thereon and will be capable of being slid back and forth upon such straight edge in an obvious manner. For the purpose of holding said trammel-point upon a ruler or other instrument, a set screw 4 is located within a screw-threaded opening in the body piece 1 above the notch or open slot 2 so that it can be screwed down to hold the trammel-point, as will be clearly seen. The portion of the body piece 5 above and overhanging the notch or open slot 2, and through which the set screw 4 passes, is cut away at one side to provide two angular faces 6 and 7, said face 7 being located in the same plane as the rear wall 3 of said notch or open slot, while the face 6 is preferably located at a right angle thereto. The point or pin 8 projects at the bottom of said body piece 1 and is normally located so that its point stands in alignment with the rear wall 3 of said notch or open slot and also in alignment with the angle formed by the faces 6 and 7 of the overhanging portion 5 of the body piece, so that when; said trammel-point is secured to the edge of a ruler the point of the pointer will be in alignment with the edge of the ruler and the said angle formed by the faces 6 and 7 will serve as a gage, for it will be noted that at whatever point said angle between the faces is located, the point of the pointer or pin 8 will be directly below the same, so that great particularity-and preciseness are possible in theemployment of a trammel-point of this construction.

As a further and separate improvement in trammel-points I make the pointer or pin 8 adjustable. To secure this end the said pin 8 is carried by a spring piece 9 which passes through a recess 10 in the body piece and which forms an extension of the slot or notch 2'andis secured at its upper end to the upper portion of the body piece. The free end portion of said pointer is located within a slot 10 and lower portion of the body piece, which slot is located parallel with the rear wall ,of the slot or notch 2, so that when the said pointer or pin is moved within the slot its point will always move parallel and below the rear wall 3 or the angular face 7 of the body piece, and will at alltimes therefore be below the edge of the ruler or piece to which it may be attached. The device for moving said pointer or pin consists of an adjusting screw 11 that passes through an opening in the body piece adjacent to the slot 10 and is provided with a tapered end 12 adapted to enter the said slot 10 and engage the pointer or pin 8. As shown in Fig. 5 the tapered end of said adjusting screw is located within the slot and has pressed the pointer or pin 8 to one end of 0 the slot, and this is the normal position in which said pin will stand, and when in this position its point will be directly in alignment with the angle formed by the faces 6 and 7 v of the body piece. It will thus be seen that 5 whenthe trammel-point is being used to obtain very fine measurements that, instead of changing the position of the trammel-point upon the ruler, by means of the set screw 4,

a much finer and quicker adjustment can be made by simply turning the adjusting screw to withdraw its tapered end l2 from the slot 10, whereupon'the said pointer or pin Will move toward the other end of the slot under the influence of the spring arm or piece by which it is held, which at all times keeps the pointer under tension and tends to move it toward the other end of the slot.

It will, of course, be understood that my invention can be used for various purposes in making measurements, drawing circles,striking tangents and segments and various other measurements, and I will therefore not pro ceed to describe these several uses to which it can be put, as the same will be obvious to persons who will use the same. 7 t

It will, of course, be understood that apiece of lead or other marking device can be inserted within the slot 10 and can be held therein by screwing the tapered end-of the adjusting screw against the same to hold it in position, and thus the device can be nsed to mark a circle.

I claim as my invention- 1. A trammel-pointcomprising a bod y piece 1 having a notch or openslot in the side there-- of, a set screw having its'end located to pass into said notch or open slot, and a pointer-or pin secured to said body piece-and having its 1 point or tip located in alignment with the rear wall of said notch or open slot.

2. A trammel -point comprisingiabody piece having'a notch or open slot in the side thereof, a set screw passing through theoverh'anging portion 5 formed by said notch or slot, a straight plane face 6 uponsaid overhanging portion 5 and a pointer or pin secured't o-sa id podypieceand located in-aligninent'w-ith said 3. Atram mel-point comprisingabody piece having a notch or open slot in the side thereof, a setscrew 4 in the overhanging portion5 1 formed by said notch or open slotysaid overhanging portion 5 being cut away to provide two angular faces 6 and 7, and said face7 beinglocatedin the same plane with the rear wall?) of said notch or open slot, and a pointer or pin secured to said body piece and located beneath and in alignment within the juncture of the said angular faces 6 and 7.

4. A trammel-point comprising a body piece provided with devices for attaching the same to a bar or other instrument, and apointer or pin located within a slot in said body piece and carried by a spring arm or piece 9 secured to said body piece, and devices for moving said pointer or pin within said slot against its spring tension.

5. Atramm'el-point comprisingabody piece provided with devices for attaching the same to a rod or analogous instrument, a pointer or pin 8 located within a slot 10 in said body piece and carried by a spring piece or arm 9 secured to said body piece, and an adjusting screw providedwith a tapered *end 12 located within a screw-threaded opening adjacent to theslot 10 and adapted to engage the said pointer or pin '8.

'6. h'trammel-pointcmnprisingabody piece having an open slot in one side thereof, and provided with devices for attaching the same to a rod or analogous instrnment,apointeror pin 8 located within asiot I0 snd'carried by a spring piece or arm 9 secured to said body piece, said slot 10 being located parallel with the rear wall of the notch or open slot in the side of said body -piece, and devices for moving said pointeror pin 8 within the slot against the tension of the spring piece or arm 9.

Intest'imony whereof I affixmy signatnre in presence of two witnesses.

BRUNO. l-Vitnesses:

RUDOLPH W. Lo'rz, WM. H. :IJOTZ. 

